Leather-skiving machine.



No. 852,277. PATENTED APR. 30, 1907.

I P. J. LAPHAM.

LEATHER SKIVING MACHINE.

APPLICATION FILED AUG. 11,1905.

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PAUL JOSEPH LAPI-IAM, OF GENOA, ILLINOIS.

LEATHER-SKIVING IVIACHINE.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed August 11, 1905. Serial No. 273,730.

To all 11/71/0711, it may concern.-

Be it known that I, PAUL JOSEPH Larnau, a citizen of the United States, residing at Genoa, in the county of Dekalb and State of 2 Illinois, have invented new and useful Improvements in Leather-Skiving Machines, of which the following is a specification.

This invention relates to leather skiving machines for beveling the edges of the sections or parts of leather used in the manufacture of boots and shoes, and other articles, where it is necessary or desirable to have the contiguous edges of the parts thinned down for avoiding objectionable increase in the thickness where they are over-lapped, or for any other reason; and it has more special reference to that type of leather skiving machines which employ a rotary disk-like cutter arranged contiguous to a feed roll and a presser bar which serves to feed the leather past the edge of the knife while the knife rotates and thereby shaves the edge of the leather and reduces its thickness as before mentioned; and my invention has for its primary object to provide improved and efficient means whereby the edge of the leather will be held down firmly against the feed roll where it has been reduced in thickness by the knife as well as at other places, so that the liability of the thin portion or edge which was produced by a previous cut, springing up into engagement with the edge of the knife, when producing an inter-secting cut, will be prevented.

With a view to the attainment of these ends, and the accomplishment of certain other objects hereinafter appearing, the invention consists in the features of novelty which will now be described with reference to the accompanying drawings and more particularly pointed out in the claims.

In the said drawings,-Figure 1 is a per spective view of a part of a leather skiving machine embodying this invention. Fig. 2 is a view of a piece of leather after it has been skived. Fig. 3 is a plan view of the presser bar or gage on a larger scale. Fig. 4 is an end view thereof. Fig. 5 is a side view thereof. Fig. 6 is a side view of the oppo site side to that presented in Fig. 5, partly broken away and partly in section. Fig. 7 is a vertical cross-section on a larger scale, taken on the line 7, 7, Fig. 3; and Fig. 8 is a diagrammatic view of the leather in crosssection and the position of the gage thereon.

1 is the knife orglisk cutter, which may be I I I i f i I supported and operated in any suitable way, not necessary to illustrate, and in this particular example of the invention a feed disk is also employed for holding the leather 3 down against a plane reduced portion 4 of the feed roll, the corrugated or roughened portion of which is indicated at 5, and serves together with the feed disk 2 to feed, the leather 3 under the knife 1 and against the edge thereof while running against a suitable guard or guide 6 which limits the extent to which the leather is introduced and thereby gages the width of the cut, permitting the knife 1 to shave oil the top of the leather where it runs over the high portion 5 of the feed roll, other parts of the leather being held down out of the plane of the cutting edge of the knife by being depressed into the low portion 4.- of the feed roll by the feed disk 2, thus beveling or shaving the edges of the leather as shown at 6, 7, in Fig. 2. In order that the edge of the leather to be beveled may not spring upwardly in advance of the cutter 1, to such an extent as to be entirely severed or unduly reduced in thickness, a presser foot or gage, so;neti1ncs called a guide, is caused to bear thereon immediately in advance of the knife edge. This presser foot is, of course, set to give the proper pressure while the full thickness of leather is passing thereunder, and consequently when the portion which has already been reduced in thickness by a previous cut on the other edge arrives at the edge of the knife it is forced upwardly by the higher portion 5 of the feed roll and into the plane of the knife and is thereby cut through or damaged, whereas if the presser foot were of such construction as to depress the thin part as well as the thick part and hold it firmly against the feed roller this could not occur. It is one of the especial purposes of this invention to accomplish that result and therefore instead of using a solid or continuous presser foot, for thus holding the leather against the feed roll, a series of independent blocks or sections 8, 9, 10, 11 and 12, having rounded bearing surfaces 13, are employed. These are mounted in any suitable guide frame 01' housing 14, and are limited in their downward move ments by stops 15 formed on each and engaging over the edge of the guide frame while their upward movement is yieldingly resisted by springs 16 arranged in sockets 17 under adjusting screws 18 in the frame 14 and bear ing against shoulders 19 on the individual and they may also be beveled in a direction lengthwise of the series, as shown in Figs. 5 and 6, if desired.

The housing or guide frame 1 1 is secured to or formed on an arm 21, which is mounted upon a second arm 22 which carries the guard 6 and which is provided with a slot 23 whereby it may be adjustably secured to guide bracket 24 by set-screw 25. The purpose of the independent arm 21 is to provide for the adjustment of the lower edge of the presser foot in a rotary direction, with reference to the periphery of the feed roll 4, 5, or in other words to provide for the lower edge of the presser foot being arranged more or less at an angle to the axis of the said feed roll. In order that this may be conveniently accomplished, the attachment between the arms 21, 22, is effected by means of three screws 26, 27, 28, the screws 26, 27, passing loosely through arm 21, being screw-threaded in arm 22, and screw 28 being threaded in arm 21, and either bearing against arm 22, or thread therein, also,so as to constitute a fulcrum for the arm 21 to tip on when one of the screws 26, 27, is tightened and the other re leased. It will also be seen that with this means the arm 21 may be adjusted with respect to the arm 22 while maintaining its parallel relation thereto, by loosening or tightening the screws 26, 27, equally, and loosening or tightening the screw 28 accordingly.

In the operation of the device, the leather is passed over the roll 4, 5, and under the feed disk 2 toward the knife 1 in the usual manner, while the presser foot acts to depress the edge of the leather against the corrugated portion 5 of the feed roll uniformly throughout the width of said corrugated portion, thereby producing a bevel along one edge of the leather, as for example the bevel 7, shown in Fig. 2. The leather is then again introduced and run through in the same manner to produce the bevel on the opposite edge, as for example the bevel 6, Fig. 2, which is shown in this figure as only partially com pleted, but which in practice is carried entirely across the edge until the two bevels converge at the corner. If the presser foot were a solid integral member, it would serve to hold the leather down against the corrugation 5 until the inner edge of the bevel 6 intersected the inner edge of the bevel 7, when a part of the presser foot would be resting upon the uncut portion of the leather at the lower side of Fig. 2, and the other part or outer end would be projected across beveled portion 7, and as'the uncut portion would hold'the presser foot aloof from the bevel portion 7 the latter would be permitted to spring upwardly against the edge of the knife and in fact would be forced upwardly by the corner produced between the plane portion 4 and the higher corrugated portion 5 of the feed roll. This would result in producing a slot 29 along the line of the inner edge of the bevel 6, or it might cut the leather through at other places and otherwise damage it. WVith this improvement, however, it will be seen that when the presser foot arrives at the uncut portion 6 of the leather, those sections of the presser foot which project over the bevel 7 will instantly descend against the bevel part 7, as shown in Fig. 8, and hold the same down snugly against the corrugated portion of the roll, so that it can not rise into engagement with the knife while the bevel 6 is being completed.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is:

1. In a leather skiving machine the combination with a feed roll and a knife, of a presser foot for holding the leather against the said roll in advance of the knife, comprising a'series of independently movable sections having their lower ends rounded downwardly toward the roll and beveled or inclined from the inner end of the series upwardly and outwardly.

2. In a leather skiving machine the combination with a feed roll and a knife of a presser foot for holding the leather against the roll in advance of the knife, a longitudinally adjustable arm movable lengthwise of the axis of the roll, a second arm carrying the presser foot, an adjusting screw screwthreaded in the second arm and bearing against the first arm, and two additional adjusting screws passing loosely through the second arm and screw-threaded in the first arm at both sides of said. first screw.

3. In a leather skiving machine, the com bination with a feed roll and a knife, of a presser foot for holding the leather against the said roll in advance of the knife, comprising a series of independently movable sections having their lower ends rounded downwardly toward the roll and beveled or inclined from the inner end of the series upwardly and outwardly and contacting with each other to form an approximately continuous pressing surface.

In witness whereof, I have hereunto set IOR my hand. this 3d day of August 1905, in the Witnesses:

ELMA E. SMoox, E. W. BROWN. 

